Objective c key path operators @avg,@max .....
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by davide
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Published on 2010-04-03T22:53:37Z
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2010/04/03
23:03 UTC
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arr = [[NSMutableArray alloc]init];
[arr addObject:[NSNumber numberWithInt:4]];
[arr addObject:[NSNumber numberWithInt:45]];
[arr addObject:[NSNumber numberWithInt:23]];
[arr addObject:[NSNumber numberWithInt:12]];
NSLog(@"The avg = %@", [arr valueForKeyPath:@"@avg.intValue"]);
This code works fine, but why? valueForKeyPath:@"@avg.intValue" is requesting (int) from each NSNumber, but we are outputting a %@ string in the log. If i try to output a decimal %d i get a number that possibly is a pointer to something. Can somebody explain why the integers become NSNumbers when i call the @avg operator?
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